WO1998020598A1 - Device for controlling fault currents in a rotating electric machine - Google Patents
Device for controlling fault currents in a rotating electric machine Download PDFInfo
- Publication number
- WO1998020598A1 WO1998020598A1 PCT/SE1997/001844 SE9701844W WO9820598A1 WO 1998020598 A1 WO1998020598 A1 WO 1998020598A1 SE 9701844 W SE9701844 W SE 9701844W WO 9820598 A1 WO9820598 A1 WO 9820598A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- rods
- pipes
- end winding
- electrical machine
- rotating electrical
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/46—Fastening of windings on the stator or rotor structure
- H02K3/50—Fastening of winding heads, equalising connectors, or connections thereto
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/40—Structural association with grounding devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/32—Windings characterised by the shape, form or construction of the insulation
- H02K3/40—Windings characterised by the shape, form or construction of the insulation for high voltage, e.g. affording protection against corona discharges
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
- H02K2203/15—Machines characterised by cable windings, e.g. high-voltage cables, ribbon cables
Definitions
- the present invention relates to a device for controlling fault currents in the end winding region of the stator in a rotating high-voltage electric machine.
- the type of machines under consideration may, for instance, be synchronous machines, asynchronous machines, dual-fed machines, outerpole machines and synchronous flow machines.
- the machines are in the first place intended to be used as generators in power stations for generating electric power.
- the machines are intended to be used at high voltages, a typical operating range being voltages from 36 kV up to 800 kV, for instance, so that they can be connected directly to all types of high-voltage power networks.
- the machines uses high-voltage insulated electric conductors for the stator winding, in the following called winding cables, with solid insulation similar to cables for transferring electric power, e.g. XLPE - cables.
- the cable is also provided with an outer semi-conducting layer with the help of which its outer potential is defined.
- the high voltage cables thus enclose the electrical field within the windings.
- Such an insulated conductor or cable is flexible and it is of a kind which is described more in detail in the PCT applications SE97/00874 and SE97/00875. Additional descriptions of the concerned insulated conductor or cable can be found in the PCT applications SE 97/009001, SE 97/00902 and SE97/00903.
- the object of the present invention is therefore to provide a device in the end winding region, which enables such control of fault currents.
- Arcs occurring in the event of a fault are detected by measuring the current or its derivatives in the phases, for instance, by electronics being provided to disconnect the machine if the current becomes too high or/and if the derivative becomes too large. Another type of fault detection is based on comparing incoming and outgoing currents and, if the difference between them is sufficiently great, this is taken as an indication that a fault exists. Arc monitors in the form of optical detectors are also used.
- the conducting material can be a rod, pipe or the like with a diameter chosen to be as small as possible in order to minimize eddy-current losses, but sufficiently large enough to enable fault currents to be deflected during fault conditions.
- the rods or the pipes are placed so close together in the end winding region that electric arcs in the event of an internal fault are safely directed to ground, i.e. an arc occurring in the event of an internal fault is safely caught by the fault-current control device before it finds its way to other cables or the stator lamination.
- the rods or the pipes are inserted a certain distance into the end winding region, this distance being limited so that eddy currents produced in the rods or the pipes are below a predetermined magnitude.
- the rods or the pipes are slotted in order to reduce eddy-current losses.
- the rods or the pipes comprise a plurality of rods or pipes of small diameter combined to a bundle having sufficient cross-sectional area to deflect short-circuiting currents arising in the end winding region in the event of a fault.
- the rods or the pipes are arranged to be in contact with spacers made of resilient, electrically conducting material, said spacers being applied between adjacent winding cables in the end winding region, in contact with the semiconducting layers of the winding cables.
- the rods or the pipes may hereby be inserted into the spacers or into lugs provided on the spacers and each rod or pipe may be arranged to be in contact with several spacers arranged one after the other in the direction of the stator end. In this way the cables in the end winding region part are grounded via the fault-current control rods or pipes which are designed to be able to deflect considerable fault currents.
- the rods, pipes or the like are also used to mechanically stabilize the end winding.
- an arc due to an internal fault in the end winding region will be directed to ground via a fault-current control device. The damage to the end winding region is thus reduced.
- Figure 1 shows a part of the stator, partially cut away and with the rotor removed
- Figure 2 shows a part of the end winding region with rods inserted for fault current control
- Figure 3 shows a part of the end winding region seen from “ inside” the end winding , with spacers between the cables grounded by means of the fault-current control rods,
- Figures 4 and 5 shows a detail of the end winding region in Figure 3 on a larger scale.
- Figure 6 shows the arrangement in Figures 4 and 5 grounded through a fault- current control rod
- Figures 7, 8 and 9 are views corresponding to Figures 4, 5 and 6, respectively, showing an alternative embodiment of the spacers between the cables.
- Figure 1 thus shows a part of the stator 2 in a rotating high-voltage electric machine.
- the stator 2 is partially cut away and the rotor removed for greater clarity.
- the stator winding cables are placed in radial slots 8 in the stator core.
- the slots 8 extend to the rear section 4 of the stator core.
- Figure 2 shows a part of the upper end winding region of the stator as shown in Figure 1 with fault-current control rods inserted between the cables 12 in the end winding region.
- the fault-current control rods 10 in the figure are inserted from above, ending a certain distance from the lamination upper surface 13.
- the rods 10 are grounded and the conductors 14 are designed to connect several rods, at 16 ... 18, to a group of rods 10.
- the rods 10 are placed so close together in the end winding that an arc in is safely directed to ground via the rods 10 and conductor 14 without finding its way to other cables 12 or to the stator lamination, which would otherwise be damaged.
- the conductor 14 is preferably made of copper or aluminium.
- Each fault-current control rod 10 suitably comprises a plurality of rods of small diameter, e.g. 3 mm, combined in to a bundle of rods having sufficient cross- sectional area, e.g. 100 mm 2 , to deflect short-circuit currents appearing in the end winding region in the event of a fault. The eddy-current losses are thus reduced.
- Figure 3 shows a part of the end winding region from “ inside” the end winding, with spacers 20 arranged between adjacent cables 12.
- Adjacent cables 12 are thus clamped together (not shown in detail in the figures) with an intermediate spacer 20 of a resilient, electrically conducting material.
- the cables 12 consist of a conducting core 22, surrounded by a semi-conducting layer 24, a solid insulation 26 and an outer semi-conducting layer 28 in contact with the spacers 20, as can be seen in Figure 4.
- the outer semi-conducting layers 28 of the cables 12 are thus electrically connected to each other through intermediate spacers 20.
- a protruding lug 30 with a hole 32 running through it, is provided at the side of the spacers 20.
- a fault-current control rod 10 is inserted through the hole 32 in the lug 30 and connected to ground via the conductor 14, see Figures 3 and 6.
- the semi-conducting outer layers 28 of the cables 12 are therefore grounded via spacers 20, fault-current control rods 10 and the ground conductor 14.
- each conductor 14 is connected to a plurality of fault-current control rods, illustrated at 16...18 in a group of rods.
- Figures 7, 8 and 9 show views corresponding to those in Figures 4, 5 and 6, respectively, of an alternative embodiment of the spacer 34 with an elongated lug or flange 36 which, unlike the lug 30 in Figures 4-6, extends along the entire length of the spacer 34.
- a hole 38 runs through this flange 36, in which a fault- current control rod 10 is inserted via the conductor 14 which combines several fault-current control rods, at 16...18, in to a group of rods, connected to ground.
- the ground potential is normally defined by the outer casing of the machine.
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP52129998A JP2001503597A (en) | 1996-11-04 | 1997-11-04 | Fault current control device in rotating electric machine |
BR9712856-2A BR9712856A (en) | 1996-11-04 | 1997-11-04 | Device for controlling leakage currents in a rotating electrical machine |
EP97912611A EP0935839A1 (en) | 1996-11-04 | 1997-11-04 | Device for controlling fault currents in a rotating electric machine |
CA002270341A CA2270341A1 (en) | 1996-11-04 | 1997-11-04 | Device for controlling fault currents in a rotating electric machine |
PL97333178A PL333178A1 (en) | 1996-11-04 | 1997-11-04 | A device for monitoring disturbance currents at an electric rotary machine |
IL12973697A IL129736A0 (en) | 1996-11-04 | 1997-11-04 | Device for controlling fault currents in a rotating electric machine |
AU49736/97A AU721365B2 (en) | 1996-11-04 | 1997-11-04 | Device for controlling fault currents in a rotating electric machine |
NO992130A NO992130L (en) | 1996-11-04 | 1999-05-03 | Device for controlling fault currents in a rotary electric machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9604034-0 | 1996-11-04 | ||
SE9604034A SE512914C2 (en) | 1996-11-04 | 1996-11-04 | Device for controlling fault currents in a rotating electric machine |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998020598A1 true WO1998020598A1 (en) | 1998-05-14 |
Family
ID=20404491
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1997/001844 WO1998020598A1 (en) | 1996-11-04 | 1997-11-04 | Device for controlling fault currents in a rotating electric machine |
Country Status (13)
Country | Link |
---|---|
EP (1) | EP0935839A1 (en) |
JP (1) | JP2001503597A (en) |
CN (1) | CN1235707A (en) |
AU (1) | AU721365B2 (en) |
BR (1) | BR9712856A (en) |
CA (1) | CA2270341A1 (en) |
CZ (1) | CZ147299A3 (en) |
IL (1) | IL129736A0 (en) |
NO (1) | NO992130L (en) |
PL (1) | PL333178A1 (en) |
SE (1) | SE512914C2 (en) |
TR (1) | TR199900966T2 (en) |
WO (1) | WO1998020598A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1515413A1 (en) * | 2003-09-12 | 2005-03-16 | Siemens Westinghouse Power Corporation | Support structure for high-voltage conductors |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102427283A (en) * | 2011-10-17 | 2012-04-25 | 衣广津 | Choking coil |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1418856A (en) * | 1919-05-02 | 1922-06-06 | Allischalmers Mfg Company | Dynamo-electric machine |
DE584639C (en) * | 1929-12-28 | 1933-09-27 | Aeg | Corona protection for windings in electrical machines |
DE2050674A1 (en) * | 1969-10-29 | 1971-05-19 | Asea Ab | Arrangement for avoiding glow discharges on electrical conductors |
US5036165A (en) * | 1984-08-23 | 1991-07-30 | General Electric Co. | Semi-conducting layer for insulated electrical conductors |
DE4022476A1 (en) * | 1990-07-14 | 1992-01-16 | Thyssen Industrie | Electric cable for three=phase AC winding of linear motor - covers one phase by inner conducting layer surrounded by insulation and outer conducting layer |
-
1996
- 1996-11-04 SE SE9604034A patent/SE512914C2/en not_active IP Right Cessation
-
1997
- 1997-11-04 EP EP97912611A patent/EP0935839A1/en not_active Withdrawn
- 1997-11-04 CA CA002270341A patent/CA2270341A1/en not_active Abandoned
- 1997-11-04 JP JP52129998A patent/JP2001503597A/en active Pending
- 1997-11-04 IL IL12973697A patent/IL129736A0/en unknown
- 1997-11-04 TR TR1999/00966T patent/TR199900966T2/en unknown
- 1997-11-04 CZ CZ991472A patent/CZ147299A3/en unknown
- 1997-11-04 PL PL97333178A patent/PL333178A1/en unknown
- 1997-11-04 WO PCT/SE1997/001844 patent/WO1998020598A1/en not_active Application Discontinuation
- 1997-11-04 AU AU49736/97A patent/AU721365B2/en not_active Ceased
- 1997-11-04 BR BR9712856-2A patent/BR9712856A/en not_active IP Right Cessation
- 1997-11-04 CN CN97199377A patent/CN1235707A/en active Pending
-
1999
- 1999-05-03 NO NO992130A patent/NO992130L/en not_active Application Discontinuation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1418856A (en) * | 1919-05-02 | 1922-06-06 | Allischalmers Mfg Company | Dynamo-electric machine |
DE584639C (en) * | 1929-12-28 | 1933-09-27 | Aeg | Corona protection for windings in electrical machines |
DE2050674A1 (en) * | 1969-10-29 | 1971-05-19 | Asea Ab | Arrangement for avoiding glow discharges on electrical conductors |
US5036165A (en) * | 1984-08-23 | 1991-07-30 | General Electric Co. | Semi-conducting layer for insulated electrical conductors |
DE4022476A1 (en) * | 1990-07-14 | 1992-01-16 | Thyssen Industrie | Electric cable for three=phase AC winding of linear motor - covers one phase by inner conducting layer surrounded by insulation and outer conducting layer |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1515413A1 (en) * | 2003-09-12 | 2005-03-16 | Siemens Westinghouse Power Corporation | Support structure for high-voltage conductors |
US7002278B2 (en) | 2003-09-12 | 2006-02-21 | Siemens Westinghouse Power Corporation | Support structure for high-voltage conductors |
Also Published As
Publication number | Publication date |
---|---|
SE512914C2 (en) | 2000-06-05 |
NO992130D0 (en) | 1999-05-03 |
NO992130L (en) | 1999-05-03 |
AU721365B2 (en) | 2000-06-29 |
CA2270341A1 (en) | 1998-05-14 |
PL333178A1 (en) | 1999-11-22 |
IL129736A0 (en) | 2000-02-29 |
SE9604034D0 (en) | 1996-11-04 |
CN1235707A (en) | 1999-11-17 |
AU4973697A (en) | 1998-05-29 |
CZ147299A3 (en) | 1999-12-15 |
SE9604034L (en) | 1998-05-05 |
JP2001503597A (en) | 2001-03-13 |
TR199900966T2 (en) | 1999-08-23 |
BR9712856A (en) | 1999-12-07 |
EP0935839A1 (en) | 1999-08-18 |
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